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Analog Devices Inc. LTC3834EDHC-1#PBF
- Part No.:
- LTC3834EDHC-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC3834EDHC-1#PBF.pdf
- Description:
- IC REG CTRLR BUCK 16-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,474
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Product details
Overview
LTC3834EDHC-1#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency, constant-frequency current-mode synchronous step-down controller driving dual N-channel MOSFETs. It delivers 0.8V to 10V output from 4V–36V input, achieves ±1% output voltage accuracy, operates with 30μA no-load quiescent current, and supports phase-lockable switching frequencies from 140kHz to 650kHz - ideal for battery-powered telecom and automotive power systems requiring ultra-low IQ and wide VIN range.
For engineers reviewing the LTC3834EDHC-1#PBF datasheet, LTC3834EDHC-1#PBF pinout, LTC3834EDHC-1#PBF application, or LTC3834EDHC-1#PBF equivalent, key selection criteria include its 30μA IQ in sleep mode, OPTI-LOOP® compensation for transient optimization across diverse COUT/ESR, 99% duty cycle dropout capability, selectable light-load operation (Burst Mode®/pulse-skipping/continuous), and precise 0.8V reference with ±1% regulation over temperature and line/load.
Technical Context
The LTC3834EDHC-1#PBF implements a constant-frequency current-mode architecture with an internal 0.8V precision reference and transconductance error amplifier (gm = 0.5 mmho). Its OPTI-LOOP® compensation allows dynamic loop tuning via external capacitor on ITH, enabling stable response across wide output capacitance and ESR ranges.
It features dual gate drivers (TG/BG) with 50–90ns transition times, integrated INTVCC LDO (5.25V ±1%), and a dedicated PLLIN/MODE pin that serves dual roles: external clock synchronization (140–650kHz lock range) and light-load mode selection (Burst Mode®, pulse-skipping, or forced continuous). The device lacks CLKOUT, PGOOD, and EXTVCC pins versus the LTC3834, confirming its streamlined feature set for cost-optimized designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 36V - supports 12V/24V automotive, telecom, and industrial bus rails without pre-regulation. |
| Output Voltage Range | 0.8V to 10V - programmable via external resistor divider; enables core logic, FPGA I/O, and analog supply generation. |
| No-Load Quiescent Current | 30μA - extends battery life in always-on portable and remote-sensing applications. |
| Output Voltage Accuracy | ±1% over line, load, and temperature - ensures reliable regulation for sensitive digital loads. |
| Switching Frequency Range | 140kHz to 650kHz (phase-lockable) - balances efficiency (lower fSW) vs. size (higher fSW) with external synchronization support. |
| Max Duty Cycle | 99.4% - enables ultra-low dropout operation (e.g., 5V→4.95V at high current) without external bias. |
| Current Sense Threshold | 85mV to 115mV - sets peak inductor current with ±15mV tolerance; determines RSENSE for IMAX design margin. |
Pinout & Package
Package: 16-lead (5mm × 3mm) plastic DFN with exposed thermal pad (Pin 17 = SGND), rated for –40°C to +85°C operation. Requires soldering of exposed pad to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLLPF (Pin 1) | PLL low-pass filter node | Connects external RC filter when synchronizing to external clock; floating/INTVCC/SGND selects 400/530/250kHz nominal fSW. |
| ITH (Pin 2) | Error amplifier output & compensation point | Controls peak inductor current; external capacitor here implements OPTI-LOOP® for optimized transient response. |
| TRACK/SS (Pin 3) | Soft-start and tracking input | Internal 1μA pull-up charges external capacitor for controlled VOUT ramp; also accepts resistor divider for supply tracking. |
| VFB (Pin 4) | Feedback input | Compares against 0.8V internal reference; regulates output by servoing VFB to 0.8V or lower TRACK/SS voltage. |
| SGND (Pin 5) | Small-signal ground | Reference for control circuitry; must be routed separately from PGND to avoid noise coupling into feedback path. |
| PGND (Pin 6) | Power ground | Return path for bottom MOSFET source, Schottky cathode, and input capacitor - ties to high-current return plane. |
| BG (Pin 7) | Bottom gate driver output | Drives synchronous N-MOSFET source; swing = 0V to INTVCC (5.25V), capable of 3A peak sink/source. |
| INTVCC (Pin 8) | Internal LDO output | 5.25V ±1% regulated supply for drivers and logic; requires ≥4.7μF ceramic/tantalum decoupling to PGND. |
| VIN (Pin 9) | Main input supply | Accepts 4V–36V; powers INTVCC LDO and provides bootstrap recharge path; bypass to SGND required. |
| SW (Pin 10) | Switch node | Connects to inductor and BOOST capacitor; voltage swings from ~–0.3V (Schottky drop) to VIN. |
| TG (Pin 11) | Top gate driver output | Floating driver output referenced to SW; swing = SW to (SW + INTVCC − 0.5V); drives high-side N-MOSFET gate. |
| BOOST (Pin 12) | Bootstrap supply | Connected via capacitor to SW; supplies TG driver; diode from INTVCC ensures recharge during off-time. |
| RUN (Pin 13) | Enable/shutdown control | Logic-level input; <0.7V disables controller and reduces IQ to 4μA; internal 0.5μA pull-up enables auto-start. |
| SENSE− (Pin 14) | Current sense negative input | Differential input to current comparator; connects to low-side of RSENSE; common-mode range: SGND to 10V. |
| SENSE+ (Pin 15) | Current sense positive input | Differential input to current comparator; connects to high-side of RSENSE; used with SENSE− to set ILIM. |
| PLLIN/MODE (Pin 16) | Synchronization & light-load mode select | External clock input (140–650kHz lock) OR DC level select: GND = Burst Mode®, INTVCC = continuous, 0.8–INTVCC−0.5V = pulse-skipping. |
Key Features
| Feature | Design Value |
|---|---|
| OPTI-LOOP® Compensation | Enables single external capacitor on ITH to optimize loop stability across 10× variation in output capacitance and ESR - eliminates trial-and-error compensation. |
| Ultra-Low Quiescent Current | 30μA sleep-mode IQ extends runtime in battery-backed systems (e.g., telematics, remote sensors) without sacrificing fast wake-up. |
| 99.4% Maximum Duty Cycle | Supports near-100% conduction in dropout (e.g., 5V input → 4.95V output), eliminating need for external bias or auxiliary supply. |
| Selectably Optimized Light-Load Efficiency | Three operational modes - Burst Mode® (highest efficiency), pulse-skipping (low ripple/noise), or forced continuous (lowest ripple) - configurable via single pin (PLLIN/MODE). |
| Integrated INTVCC LDO | On-chip 5.25V regulator powers gate drivers and control logic from VIN, removing need for external bias rail and simplifying BOM. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module Supply |
|---|---|
Use Scenario: Generating 3.3V/5A for DSP, memory, and interface ICs in head-unit systems with 9V–16V battery input and strict 30μA standby requirement. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current, low-noise, and ultra-low-IQ power conversion. Use Value: 30μA IQ meets OEM cold-cranking and parking-mode current budgets; 99% duty cycle maintains regulation during cranking dips to 6V. |
Use Scenario: Providing 5V/3A for isolated digital I/O banks in DIN-rail mounted controllers operating from 24VDC industrial bus. IC Role / Device Role / Timing Role: High-reliability step-down controller with robust current sensing and overvoltage protection for harsh EMI environments. Use Value: ±1% VOUT accuracy ensures sensor ADC reference stability; output overvoltage protection (10% OV threshold) safeguards downstream logic during transients. |
| Telecom Remote Radio Unit (RRU) | Portable Medical Diagnostic Device |
Use Scenario: Converting 48V backplane to 12V/8A for RF power amplifiers in outdoor base stations with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: High-input-voltage synchronous controller with phase-lock capability to synchronize switching with system clock and reduce EMI. Use Value: 140–650kHz PLL lock range enables deterministic noise placement; 43.5°C/W θJA (DHC package) supports thermally constrained enclosures. |
Use Scenario: Powering FPGA, display, and analog front-end in handheld ultrasound units powered by Li-ion (3.0–4.2V) with strict battery life targets. IC Role / Device Role / Timing Role: Wide-VIN buck controller supporting direct battery input while delivering clean, regulated 1.2V/2A core supply. Use Value: Adjustable soft-start via TRACK/SS prevents inrush into large capacitive loads; 30μA IQ directly extends clinical scan time per charge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3834EGN-1#PBF | Same die, 16-lead SSOP package (wider 4×5mm footprint, higher θJA = 90°C/W) | Preferred for prototyping or layouts where DFN reflow is unavailable; less suitable for high-power density or thermally constrained designs. | Select when manual assembly, socketing, or thermal derating margin >40°C/W is acceptable. |
| MP2918GL-Z | Monolithic 30V synchronous buck converter (integrated MOSFETs); 25μA IQ; fixed 500kHz fSW; no PLL or TRACK/SS | Replaces discrete controller + FET solution where board space is critical and 0.8–5.5V output suffices; lacks programmable soft-start and external sync. | Choose for simplified layout and lower component count where full flexibility of external FETs and frequency control is not required. |
Compared with LTC3834EDHC-1#PBF, the LTC3834EGN-1#PBF offers identical functionality in a larger, easier-to-handle package but with inferior thermal performance, while the MP2918GL-Z trades configurability and external FET optimization for integration and smaller footprint - making it suitable only for mid-power, fixed-output applications.
Availability
LTC3834EDHC-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC power, telecom RRU, and portable medical devices requiring stable component supply, long-term lifecycle assurance, and guaranteed -40°C to +85°C operation.
Supply support for LTC3834EDHC-1#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3834-1 product line delivers high-efficiency, ultra-low-IQ synchronous buck controllers for demanding power systems where wide input range, precise regulation, and flexible light-load operation are essential - especially in battery-constrained and thermally limited applications.
FAQ
What is the absolute maximum input voltage rating for the LTC3834EDHC-1#PBF?
The LTC3834EDHC-1#PBF has an absolute maximum input voltage (VIN) rating of 36V. Exceeding this value - even momentarily - risks permanent damage. The device operates reliably across 4V to 36V, making it suitable for 12V and 24V automotive and industrial systems. Always observe the 36V limit during hot-swap, load-dump, or transient events.
Does the LTC3834EDHC-1#PBF support output voltage tracking during startup?
Yes, the LTC3834EDHC-1#PBF supports output voltage tracking via the TRACK/SS pin. By connecting a resistor divider from a master supply to the TRACK/SS pin, the LTC3834EDHC-1#PBF regulates its VFB to match the divider voltage - ensuring coordinated ramp-up with other rails. This avoids sequencing issues in multi-rail systems without external supervisors.
How does the OPTI-LOOP® compensation work on the LTC3834EDHC-1#PBF?
OPTI-LOOP® compensation on the LTC3834EDHC-1#PBF uses the ITH pin as both error amplifier output and compensation node. Adding a single capacitor from ITH to SGND creates a dominant pole that adapts loop dynamics to the actual output capacitance and ESR - eliminating iterative compensation design. This ensures stable transient response across 10× variations in COUT and ESR without redesign.
What are the light-load operation modes supported by the LTC3834EDHC-1#PBF?
The LTC3834EDHC-1#PBF supports three light-load modes selected via the PLLIN/MODE pin: Burst Mode® (for highest efficiency, ~30μA IQ), pulse-skipping (for low ripple and audio-noise immunity), and forced continuous conduction (for lowest output ripple). Each mode is configured with a simple DC voltage level - no external logic required.
Is the LTC3834EDHC-1#PBF pin-compatible with the LTC3834EDHC#PBF?
No, the LTC3834EDHC-1#PBF is not pin-compatible with the standard LTC3834EDHC#PBF. The "-1" variant omits CLKOUT, PGOOD, and EXTVCC pins - reducing pin count and feature set. Its pinout matches the LTC3834-1 family (GN16/DHC16), not the full-featured LTC3834. Board designs must verify pin mapping before substitution.
LTC3834EDHC-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 36V
- Frequency - Switching:
- 250kHz ~ 530kHz
- Duty Cycle (Max):
- 99.4%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DFN (5x3)
LTC3834EDHC-1#PBF FAQ
1.How can I place an order for LTC3834EDHC-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3834EDHC-1#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3834EDHC-1#PBF reliable?
The price and inventory of LTC3834EDHC-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3834EDHC-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3834EDHC-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3834EDHC-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3834EDHC-1#PBF?
LTC3834EDHC-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3834EDHC-1#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3834EDHC-1#PBF?
For technical support, including LTC3834EDHC-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3834EDHC-1#PBF requirements.
6.How does Aetrix verify that LTC3834EDHC-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3834EDHC-1#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3834EDHC-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3834EDHC-1#PBF?
All LTC3834EDHC-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3834EDHC-1#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3834EDHC-1#PBF part is unused and in its original packaging.
Return procedure for LTC3834EDHC-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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